Honest question about 2 BLMs in a DF dungeon

[Nadirah]

2 BLM should make a pull go even faster assuming it's a big pull. More than 3 means AOE! and BLM are indeed the kings of AOE. Chances are if the tank is dropping before healer runs out of mana, the tank just pulled off more than his gear or skills can handle. If not, then it's a sleepy WHM. If a pull goes long enough for all CDS to expire form the tank AND the Healer, then the fault lies with the DPS

You're mistaking them for Summoners.